Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78c1234a2c0507e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 11:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60abaeb05eaf7f6fb93ea83f2fb40a1a SHA-1: b059eeec1988251c5f85d2a9133906c5f6933dd2 SHA-256: e78c1234a2c0507e7a3ce53a0cbf1c26f3a17f55790c9ce8e7b470a909584d9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the overall structure indicate an attempt to lure users to malicious websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=the+last+lecture+by+randy+pausch+pdf PDF link annotation
    • http://cnsgafgl.netsociality.com/upload/files/rapupexalobare.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396f3250175---jumekolodosudurokekefe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d20e159---kedet.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/69695202884.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/11978073964.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/84575331061323b48784a7.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/61881366661.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/suzerol.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/kozirevuzudiboz.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/28985272377.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/36288023590.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/44489079444.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907043659.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdeaab5d3---wevalasemijidevagopipidok.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rilivenotukodaviv.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/81620476146.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fubasuduvojoxogaruf.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/xutiwevosenukapeduko.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3c34f0a5---sugozedud.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pigexojopurevutidom.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/goduwuzisanirofifunisor.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/59631132257.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 10824 bytes
SHA-256: c9165b637b09b69fe8c6b6ace4d9569bfc379f487fc2bb587ae1cec7528d6a8d
font_02_sfnt_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 16672 bytes
SHA-256: 3855a287cdad580b604ad0f470d9445967d66fd33385bf47c936de086e04a752